Pump regulator



H. S. PARDEE PUMP REGULATOR Original Filed May 26, 1920 3 Sheets--5heet- 1 I VENTOR. (v 5 0 May 5, 1925.

May5, 1925. 1,536,264

H. s. PARDEE PUMP REGULATOR Original Filed May'26, 1920 3'Sheets-Shee6- S f INVENTOR.

a ORNEY May 5, 1925. 1,536,264

- H. :s. PARDEE PUMP REGULATOR Original Filed May 26, 1920 3 Sheets-Sheefi 5 Patented May 5, 1925.

HARVEY S. PARDEE, OF CHICAGO, ILLINOIS.

PUMP REGULATOR.

Applicationfiled May 26, 1920, Serial No. 384,497. Renewed August 21, 1922. Serial No. 583,355.

To all whom it may concern:

Be it known that I, HARVEY S. PAnoEE,

a citizen of the United States, and a resident of Chicago, Illinois, have invented an Improvement in Pump Regulators, of which the following. is a specification. Thisinvention relates to mechanical apparatus, and with regard to certain more specific features, to adevice for controlling the starting and stopping of a hydraulic pump.

One of the objects of the invention is to provide a positive and reliable pilot control mechanism; another object is to provide a sensitive and yet rugged apparatus for controlling a pump or the like in accordance with variations in fluid pressure; another object is to provide a simple and elfective apparatus for selectively performing predetermined operations in accordance with a plurality of standards of fluid pressure. Other objects will be in part obvious and in part pointed out hereinafter.

The invention accordingly consists in the elements and combinations of elements, features of construction, and arrangements of parts which will be exemplified in the structure hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of various possible embodiments of the invention,

Fig. 1' is a side elevation, partly in section, of a pump and'associated parts;

Fig. 2 is a similar view partly in section, showing the control for the diaphragm.

Fig. 3 is a rear elevation (viewed from the right at Fig. 2) partly in section showing the control for the diaphragm and also the control for the electrical contact.

Fig. 4 is a front elevation (viewed from the left in Fig.2).

Fig. 5 is a plan.

Similar reference characters indicate corresponding parts throughout the several views of the drawings.

Referring now more particularly to Fig. 1, there is illustrated at 1 a pump driven by a shaft'3 through a friction clutch 5 from the driving shaft 7, which in turn is driven by the source of power 9.

The shiftable housing 11 of the clutch is held in engagement with the axially fixed cone 13 thereof by means of the compression spring 15 mounted within the clutch member 11 and bearing against said member and against a boss or bearing 17 fixed on the shaftand having the housing splined thereon. The housing is also preferably splined at its other end to the shaft 3 itself.

As above noted the spring 15 normally .shaft 7 to rotate if the source of power 9 continues to run.

The diaphragm 19 moves to the right to disengage the clutch when fluid, preferably air, under pressure is admitted to the space 27 (Fig. 2) beneath (to the left of) the diaphragm. hen such pressure is released, the restoring force of the spring 15 (Fig. 1) reengages the members 11, 13 and at the same time forces the member 21 and diaphragm back toward the left (Fig. 2).

The admission of fluid to the space 27 and the exhausting of the fluid therefrom is preferably under control of the piston 29 in the cylinder 31 which communicates with the delivery system (not shown) of the pump through the inlet port 33. This port is preferably attached to the air chamber which is ordinarily provided on the delivery side of most hydraulic pumps to smooth out fluctuations in the pump pressure; therefore the chamber or cylinder 31 is filled with air under pressure, although it will be obvious that this air could be replaced by other fluid, (liquid or gaseous) if desired. For example, the inlet port 33 could be connected to the Water on the delivery side of the pump.

When the piston 29 is in its upper position, approximately that shown in Fig. 2, air under pressure is admitted through the intakeport to the cylinder 31 and thence through the intake passage 35 to the space 27 beneath the diaphragm, forcing the diaphragm to the right and disengaging the clutch. \Vhen the piston is in its lowermostposition the intake passage 35 is out ofi from the inlet port 33, and the outlet passage 37 permits air from the space 27 to exhaust t v the portion of the cylinder above the piston and thence to atmosphere through the exhaust port 39; at this time the spring 15 closes the clutch and moves the diaphragm toward the eft.

The piston receives its upward motion from the air pressure in the inlet port 3 3, this pressure tending to raise the piston in opposition to the force exerted by the weight-arm 41 acting through the links 43.

The Weight-arm 41 rotates about the horizontal shaft 45. At the upper end of the arm is a pin 47 upon which may be hung weights 49, the line through the axis 45 and through the center of gravity of the weight-arm making approximately the angle 51 with the horizontal, as indicated in Fig. 2. In the illustration this angle varies from about 36 degrees, corresponding to the upper limit of travel of the arm as determined by the adjustable stop 53, to 25 degrees, representing the lower limit of travel (shown in dotted lines), which is preferably the position in which the piston 29 strikes the bottom of the cylinder 31. This angular travel of the weight-arm may of course be varied, both as to its magnitude and as to its upper or lower limits or both:

During the upward motion of the weightarm the weight thereof (which for convenience may be assumed to consist simply of Weights 49) exerts a downward pressure upon the piston 29 in opposition to the air pressure beneath the piston, but this downward pressure decreases as the piston rises, because it varies with the cosine of the increasing angle 51. Thus when the pressure beneath the piston reaches the point where its force exceeds the downward force exerted on the piston by the weightarm, the piston begins to rise; and since the downward force progressively decreases, the piston continues to rise at the desired speed, and a full stroke is assured.

Similarly when the weight-arm is in its uppermost position and the pressure ',bcneath the piston drops to the predetermined value at which it becomes insuflicient to maintain the weight-arm in its uppermost position (this value being adjustable by changing the setting of the stop 53 or weights 49), the weight overcomes the air pressure, and starts the piston downward.

The downward movement continues, at a suitable speed, because the downward force exerted by the weight-arm constantly increases with decrease of the angle 51, and a full stroke inthe downward direction is thus also assured.

It will thus be seen that at one predetermined standard of air pressure, say fortyfive pounds to the square inch, the piston makes a full stroke upward causing the diaphragm to move to the right and disconnect the clutch to stop the pump; while at a predetermined lower pressure, say forty pounds to the square inch, the piston is forced all the way down, exhausting the air from under the diaphragm and permitting the spring 15 to reengage the clutch, '\\'hereupon the pump starts running it the, motor is running. This prevents the pressure in the delivery system from exceeding forty-lire pounds to the square inch, and assures the operation of the pump by the motor when the pressure drops to forty pounds, if the motor is then running. It is noted that when the clutch is thus closed it remain closed, even though the motor is not then runningI The above construction may be used in conjunction with a second control, indicated particularly in Figs. 3, 4 and 5, or either control may be provided separately from the other.

The second control is effected by a weight-arm 55 provided with Weights 57 and connected by links 59 to a piston (31 mounted in the cylinder 63 having an inlet port 65 connected to the delivery system of the pump by the same conduit 67 that leads to the inlet port 33 for the cylinder 31.

The operation of this second control is similar to the first, in so far as the piston, cylinder, and weight-arm are concerned.

The piston of the second control, how ever, does not operate a diaphragm, but the weight-arm of the second control closes a contact 69 when in lowermost position, the contact springing open as the weight-arm rises.

This contact is preferably employed to close a circuit, upon the downward movement of the weight-arm, to start the motor. hen the weight-arm rises the contact is broken and the motor then may or may not stop, depending on the status of the other factors, if any, that control the starting and stopping of the motor.

For example, if the motor is an engine used for driving the pump and also for some other purpose such as running a generator, then the second control may be set to close the contact 69 at say fifteen pounds pressure to the square inch, and open the contact at say thirty-five pounds pressure to the square inch in the delivery system. As noted above, the first control may be set to close the clutch at say forty pounds to the square inch and to open the clutch at say forty-five pounds to the square inch in the delivery system. By this means the pump is subject to a dual control, the first control maintaining the pressure between forty and fortyfive pounds during the time that the motor is being operated for some other purpose. not for pumping alone; and the other control actually starting the motor in order to insure the operation of the pump when the pressure gets as low as fifteen pounds, and

allowing the motor to stop when the pressure gets up to thirty-five pounds, although allowing the pump to continue operation thereafter if the motor is then running for some other purpose, and shutting down the pump in that instance when the pressure reaches the maximum of forty-five pounds, without interfering at all with the continued operation of the motor if the motor is then still required for some other purpose.

The apparatus of the present invention is preferably used in conjunction with inventions described in one or more of my pending applications for electrical system, but is not restricted to such use.

From the above it will be seen that in the apparatus of,the present invention the several objects above noted are attained and other advantageous results secured.

As various possible embodiments might be made of the above invention and as various changes might be made in the embodiments above set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

1. In apparatus of the class described, in combination, 'fluid-pressure-operated means for opening and closing a clutch at predetermined pressure standards, and fluid-pressure-operated means for opening and closing a contact at predetermined pressure standards, the net actuating force for the moving parts of both means increasing progressively during'their stroke.

2. In apparatus of the class described, fluidpressure-operated means for opening -and closing a clutch at predetermined ressure standards, said standards being 3C1]U.Stable independently of one another, the net actuating force for the moving parts increasing during their stroke.

3. In apparatus of the class described, in combination, fluid-pressure-operated means for opening and closing a contact at predetermined and adjustwle pressure standards adjustable independently of one another, the net actuating force for the moving parts increasing progressively during their stroke.

4. In apparatus of the class described, in

.combination, fluidpressure-operated means for openingand closing a clutch at predetermined pressure standards, said standards being adjustable independently of one another, the-net actuating force for the moving parts increasing during their stroke,

whereby a full stroke is assured; and fluidpressure-operated means for opening and closing a contact at predetermined pressure standards adjustable independently of one another and of said first standards, the net actuating force for the moving parts of said second means also increasing during their stroke, whereby a full stroke is assured.

5. In apparatus of the class described, in combination, a motor, a pump, a clutch connecting the two and normally engaged, a lever, a member for operating the lever, a diaphragm adapted to move said member in one direction when suflicient pressure is applied beneath the diaphragm, and thereby to disengage the clutch, and means for admitting fluid to actuate said diaphragm when a predetermined condition is reached and for exhausting said fluid to reengage the clutch when another predetermined condition is reached, said means having a fullstroke mechanisnf.

6. In apparatus of the class described, in combination, a cylinder, a piston therein, an oscillating weight-arm connected to the piston, and means for admitting fluid under pressure to tend to raise the piston in opposition to said arm, the opposition exerted by the arm decreasing as the arm rises and increasing as the arm falls, whereby the net force actuating the piston in either direction increases progressively during the piston stroke.

7. In apparatus of the class described, in combination, a cylinder, a piston therein, an oscillating weight-arm connected to the piston, means for admitting fluid under ressure to tend to raise the piston in opposition to said arm, the oppositionexerted by the arm decreasing as the arm rises and increas- "ing as the arm falls, whereby the net force actuating the piston in either direction increases progressively during the piston stroke; and means actuated by thepiston to operate a clutch. W 0

8. In apparatus of the class described, in combination, a cylinder, a piston therein, an

oscillating weight-arm carrying an adjustable weight and. connected to the piston,

means for admitting fluid under pressure beneath the piston to tend to raise it in opposition to said weight, the opposition exerted by the weight decreasing as the weight rises and increasing as the weight falls, whereby the net force actuating the piston in either direction increases progressively during the piston stroke; and a diaphragm actuated by the piston to operate a clutch to start and stop a pump at predetermined pressures of said fluid; a second cylinder, piston and weight-arm of similar construction, and a contact operated thereby to start the pump and permit the stopping of the pump at predetermined pressures of said fluid.

9. In apparatus of the class described, in combination .a motor, a pump, a contact adapted to effect the starting of the motor, and to stop the motor if the motor is at the time not needed for some other purpose, means for closing said contact when a predetermined eondition is reached and for opening said contact when another predetermined condition is, reached; whereby the pump is subject to a control adapted to start the motor to insure operation when the said second predetermined condition is reached and allowing the motor to stop When said first predetermined condition is reached.

10. In apparatus of the class described, in combination,.a motor, a pump, a clutch connecting the two and normally engaged, a lever, a member for operating the'lever, a diaphragm adapted to move said member in one direction when suflicient pressure is applied beneath the diaphragm, and thereby to disengage the clutch, means for admitting fluid to actuate said diaphragm when a predetermined fiuid pressure is reached and for exhausting said fluid to reengage the clutch when another predetermined pressure is reached; a contact adapted to effect the starting of the motor, and to stop the motor if the motor is at the time not needed for some other purpose, means for opening said contact when a third predetermined pressure is reached and for closing said contact when a fourth predetermined pressure is reached; said four pressures being adjustable indepump is subject to a dual control,the first thereafter if the motor is then required forsome other purpose and shutting down the pump in that instance when the pressure reaches said first value.

11. In apparatus of the class described, in combination, fiuid-pressure-operated means for starting and stopping a device at predetermined pressure standards, and fluid-pressure-operated means for starting and stopping another device at predetermined standards of the pressure of the same fluid that operates the first means, the actuating force for both means increasing during their- HARVEY S. PARDEE. 

